| CHS HQ Ltd | Administrative & support | 2024 |
| CHS Personnel Ltd | Administrative & support | 2020 |
| CHS Truck & Trailer Accident Repair Centre (London) Ltd | Wholesale & retail | 2024 |
| CHS Truck & Trailer Accident Repair Centre Ltd | Wholesale & retail | 2024 |
| Chughtai Catering Ltd | Wholesale & retail | 2024 |
| Church Lane Acquisitions Limited | Real estate | 2023 |
| Church of Ambazonia Ltd | Other services | 2020 |
| Church Tree Consultancy Limited | Administrative & support | 2016 |
| Churchill Executive Ltd | Administrative & support | 2014 |
| Churchill Manor Lettings Limited | Real estate | 2020 |
| Churchill Mergers Ltd | Professional & scientific | 2020 |
| Churchill Partners Holdings Ltd | Real estate | 2017 |
| Churchill Tax Advisers and Accountants Ltd | Professional & scientific | 2011 |
| Churchill Tax Holdings Ltd | Financial services | 2019 |
| Churchill Tech Holdings Ltd | Financial services | 2019 |
| Churchill Technologies Ltd | Information & communication | 2019 |
| Churros Brothers Limited | Hospitality | 2021 |
| Churros Ltd | Administrative & support | 2022 |
| Churston House Care Ltd. | Health & social care | 2014 |
| Chuskian Limited | Hospitality | 2025 |
| Chute Partners Limited | Professional & scientific | 2025 |
| Cian Services Ltd | Construction | 2025 |
| Cianna Properties Limited | Real estate | 2025 |
| CIB Solutions Ltd | Administrative & support | 2018 |
| Cibus Services Limited | Hospitality | 2026 |
| Cicet Software Limited | Information & communication | 2023 |
| CIG Creative Design Ltd | Construction | 2020 |
| Cigar and Cork Collective Ltd | Agriculture & fishing | 2025 |
| Cigma Trading Limited | Wholesale & retail | 2019 |
| Cigv Services Ltd | Transport & logistics | 2026 |
| CII Trade Windows Limited | Construction | 2019 |
| Cikipufi Ltd | Wholesale & retail | 2021 |
| Cily Drive Services Ltd | Transport & logistics | 2026 |
| Cimh PR Ltd | Health & social care | 2019 |
| Cimraanfashion Ltd | Wholesale & retail | 2025 |
| Cinemasonics Ltd | Administrative & support | 2026 |
| Cinquecento (Haverstock Hill) Limited | Hospitality | 2020 |
| Cinquecento (London) Limited | Manufacturing | 2021 |
| Cinquecento (Notting Hill Gate) Limited | Hospitality | 2020 |
| Cinquecento (Portobello Road) Limited | Hospitality | 2019 |
| Ciocan Motors Ltd | Wholesale & retail | 2026 |
| Cipnet Services Limited | Construction | 2023 |
| Cipora Ltd | Mining & quarrying | 2026 |
| Cipry Transport Limited | Transport & logistics | 2019 |
| Circadian Digital Limited | Professional & scientific | 2022 |
| Circle Financials Limited | Professional & scientific | 2024 |
| Circle Hospitality Limited | Hospitality | 2025 |
| Circle of Misse Limited | Administrative & support | 2014 |
| Circle View Business Consultancy Ltd | Information & communication | 2010 |
| CIRCLEJ67 Consultancy Limited | Administrative & support | 2013 |
| Circlezone Ltd | Wholesale & retail | 2025 |
| Circolo Novanta Ltd | Wholesale & retail | 2025 |
| Circuit House Ltd | Construction | 2024 |
| Citadel Residences Limited | Hospitality | 2019 |
| Citec London Ltd | Wholesale & retail | 2002 |
| Citi Assets Ltd | Real estate | 2020 |
| Citi Financing Ltd | Financial services | 2020 |
| Citi Homes Ltd | Real estate | 2015 |
| Citi Investments Ltd | Real estate | 2019 |
| Citi Management Ltd | Real estate | 2024 |
| Citi Property Rentals Ltd | Real estate | 2026 |
| Citi Steel Ltd | Construction | 2022 |
| Citiaccounts Limited | Professional & scientific | 2008 |
| Citiconnect Ltd | Transport & logistics | 2023 |
| Citiprofessionals Ltd | Real estate | 2018 |
| Citis Homes Ltd | Real estate | 2017 |
| Citispace Ltd | Administrative & support | 2019 |
| Cititec Limited | Information & communication | 2016 |
| Citius Business Solutions Ltd | Wholesale & retail | 2017 |
| Citoya Ltd | Construction | 2015 |
| Citrine Clinic Limited | Other services | 2025 |
| Citrix IT Consultancy Limited | Information & communication | 2013 |
| Cits Construction Limited | Construction | 2021 |
| City & Central Barber Shops Ltd | Other services | 2016 |
| City Airport Car Services Ltd | Extraterritorial | 2014 |
| City Beds Limited | Wholesale & retail | 1985 |
| City Best Hotel Limited | Hospitality | 2004 |
| City Build Ltd | Real estate | 2025 |
| City Choice Accountants Limited | Professional & scientific | 2015 |
| City Construction Network Limited | Construction | 2019 |
| City East Construction Ltd | Construction | 2018 |
| City Flat Roofing Ltd | Construction | 2024 |
| City Gates Community Projects CIC | Health & social care | 2023 |
| City Group (INT.) Limited | Real estate | 2018 |
| City Gym London Ltd | Arts & recreation | 2023 |
| City Heat Network Ltd | Construction | 2018 |
| City Heights Holding Limited | Construction | 2025 |
| City Heights One Limited | Construction | 2013 |
| City Heights Three Ltd | Construction | 2016 |
| City Heights Two Ltd | Other services | 2015 |
| City Homes London Ltd | Real estate | 2023 |
| City Homes Property Management Limited | Real estate | 2024 |
| City Junk & Gardening Ltd | Water & waste | 2014 |
| City Law and Real Estate Holding Ltd | Administrative & support | 2018 |
| City Light Mart Ltd | Wholesale & retail | 2021 |
| City Mobile Gadgets Ltd | Wholesale & retail | 2022 |
| City of Docklands LLP | | 2013 |
| City Property Services Prime Ltd | Real estate | 2019 |
| City Refurbs Limited | Construction | 2026 |
| City Rope Ltd | Construction | 2019 |